Many dabble with the Occult at some stage. Those travelled and wise to the world know that there is a darker, unknown side to life. Necromancers toy on the fringes of the Occult energies to fuel their art, and those of zeal and religious fervor occasionally succumb to the darker side of their faith. Demons. Devils. Infernal realms. The Weird and unnatural. Elder beings you dare not awaken. All are the domain of the occult. Come; stop wading in the shallows and plunge into the depths! Fall to the darker art and discover what the Occult Brotherhood has to offer.
To purify the water from a certain river the monks have carved a section of the river that goes over a stone bed. Through holy carvings of gods, godesses, and holy symbols and then the river flowing over them, it purifies the water making it safe for drinking and/or makes it holy water. For rivers that do not have natural rock bottoms, large smooth stones can be carved and added to the water to fully cover the bottom.